Guess What Happens When You Leave McDonalds Out For 6 Months? NOTHING!

[salvorhardin]

2. What would you expect to happen? It's high fat, high salt, low moisture content food.

McDonald’s French fries, for example, which have repeatedly proven their hardiness to spoilage, contain citric acid as a preservative. But a bigger factor might be the fat content of the fries. About 50 percent of the total 250 calories contained in a small order of fries come from fat. “Anything that is high in fat will be low in moisture,” says Barry Swanson, a professor at the Washington State University department of food science. And low moisture means less room for mold to grow. They’re crisper and thinner than regular fries, which means that they’re exposed to greater heat per surface area, killing pathogens and reducing water content. McDonald’s fries are also coated in a nice, thick layer of salt, something we’ve been using as a natural preservative for the last 2,500 years.

The beef patty is also high in fat — varying between 37 and 54 percent of the total caloric content — and has been cooked at a high temperature. “It’s also very thin, which once again means high heat per surface area,” says Sean O’Keefe, a professor of food science at Virginia Tech. Davies noted that over time, her patty just shrank and hardened, losing whatever moisture it once contained.

A regular McDonald’s sesame-seed bun contains calcium propionate and sodium propionate — both preservatives. But the list of ingredients — down to the preservatives — is actually no different from what you’d find on the packaging of your average loaf of supermarket white bread. Wonder Light Enriched Buns, for example, are also loaded with calcium propionate. While neither list mentions quantities, it’s reasonable to assume that both are under the FDA-approved limit.

Ultimately, says O’Keefe, the McDonald’s haters have gotten their science wrong. “The ingredients are similar to anything you’d see in processed fast food,” he says. For better or for worse, McDonald’s is no more a chemical laboratory of secret compounds designed to embalm us from the inside than any other processed food maker. A Happy Meal manages to stay unspoiled because it is fatty, salty and practically empty of nutrients — which, really, are all good reasons to avoid it anyway.
Link: http://www.salon.com/2010/09/01/burger_that_wont_rot

If you misted that Happy Meal with water before setting it out, then you might get mold growth. Otherwise, you're just going to end up with a really desicated Happy Meal.